chore: import upstream snapshot with attribution

samples/common/globalTimerKernel.cu

@@ -0,0 +1,46 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "globalTimerKernel.h"
+
+namespace
+{
+__global__ void readGlobalTimerKernel(uint64_t* timestamp)
+{
+    if (timestamp == nullptr)
+    {
+        return;
+    }
+    uint64_t ts;
+    asm volatile("mov.u64 %0, %%globaltimer;" : "=l"(ts));
+    *timestamp = ts;
+}
+} // namespace
+
+namespace sample
+{
+// NOTE: cudaGetLastError() only surfaces synchronous launch errors (invalid
+// configuration, bad stream, etc.). Any asynchronous execution errors from
+// the kernel itself — e.g. a dereference of a bad device pointer — will not
+// be reported here; they become visible only on a subsequent synchronization
+// point such as cudaEventRecord / cudaStreamSynchronize / cudaDeviceSynchronize.
+cudaError_t launchGlobalTimerKernel(uint64_t* dTimestamp, cudaStream_t stream) noexcept
+{
+    readGlobalTimerKernel<<<1, 1, 0, stream>>>(dTimestamp);
+    return cudaGetLastError();
+}
+} // namespace sample